linux-kernel - Re: [PATCH v3 15/15] Drivers: hv: Add modules to expose /dev/mshv to VMMs running on Hyper-V

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Message-ID: <2023092342-staunch-chafe-1598@gregkh>
Date:   Sat, 23 Sep 2023 09:58:45 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Nuno Das Neves <nunodasneves@...ux.microsoft.com>
Cc:     linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arch@...r.kernel.org, patches@...ts.linux.dev,
        mikelley@...rosoft.com, kys@...rosoft.com, wei.liu@...nel.org,
        haiyangz@...rosoft.com, decui@...rosoft.com,
        apais@...ux.microsoft.com, Tianyu.Lan@...rosoft.com,
        ssengar@...ux.microsoft.com, mukeshrathor@...rosoft.com,
        stanislav.kinsburskiy@...il.com, jinankjain@...ux.microsoft.com,
        vkuznets@...hat.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
        will@...nel.org, catalin.marinas@....com
Subject: Re: [PATCH v3 15/15] Drivers: hv: Add modules to expose /dev/mshv to
 VMMs running on Hyper-V

On Fri, Sep 22, 2023 at 11:38:35AM -0700, Nuno Das Neves wrote:
> +static int mshv_vtl_get_vsm_regs(void)
> +{
> +	struct hv_register_assoc registers[2];
> +	union hv_input_vtl input_vtl;
> +	int ret, count = 2;
> +
> +	input_vtl.as_uint8 = 0;
> +	registers[0].name = HV_REGISTER_VSM_CODE_PAGE_OFFSETS;
> +	registers[1].name = HV_REGISTER_VSM_CAPABILITIES;
> +
> +	ret = hv_call_get_vp_registers(HV_VP_INDEX_SELF, HV_PARTITION_ID_SELF,
> +				       count, input_vtl, registers);
> +	if (ret)
> +		return ret;
> +
> +	mshv_vsm_page_offsets.as_uint64 = registers[0].value.reg64;
> +	mshv_vsm_capabilities.as_uint64 = registers[1].value.reg64;
> +
> +	pr_debug("%s: VSM code page offsets: %#016llx\n", __func__,
> +		 mshv_vsm_page_offsets.as_uint64);
> +	pr_info("%s: VSM capabilities: %#016llx\n", __func__,
> +		mshv_vsm_capabilities.as_uint64);

When drivers are working properly, they are quiet.  This is very noisy
and probably is leaking memory addresses to userspace?

Also, there is NEVER a need for __func__ in a pr_debug() line, it has
that for you automatically.

Also, drivers should never call pr_*() calls, always use the proper
dev_*() calls instead.



> +
> +	return ret;
> +}
> +
> +static int mshv_vtl_configure_vsm_partition(void)
> +{
> +	union hv_register_vsm_partition_config config;
> +	struct hv_register_assoc reg_assoc;
> +	union hv_input_vtl input_vtl;
> +
> +	config.as_u64 = 0;
> +	config.default_vtl_protection_mask = HV_MAP_GPA_PERMISSIONS_MASK;
> +	config.enable_vtl_protection = 1;
> +	config.zero_memory_on_reset = 1;
> +	config.intercept_vp_startup = 1;
> +	config.intercept_cpuid_unimplemented = 1;
> +
> +	if (mshv_vsm_capabilities.intercept_page_available) {
> +		pr_debug("%s: using intercept page", __func__);

Again, __func__ is not needed, you are providing it twice here for no
real reason except to waste storage space :)

> +		config.intercept_page = 1;
> +	}
> +
> +	reg_assoc.name = HV_REGISTER_VSM_PARTITION_CONFIG;
> +	reg_assoc.value.reg64 = config.as_u64;
> +	input_vtl.as_uint8 = 0;
> +
> +	return hv_call_set_vp_registers(HV_VP_INDEX_SELF, HV_PARTITION_ID_SELF,
> +				       1, input_vtl, &reg_assoc);


None of this needs to be unwound if initialization fails later on?

thanks,

greg k-h